Tool for removing ridges



Dec. 18, 1934. L Q BEARD 1,984,959

TOOL FOR REMOVING RIDGES Filed July 29, 1932 I L M .55 I 11 4 4 PatentedDec. 18, 1934 I Y UNITED. ST A'TE'S,v PATENT 'OFFICE" deer Fe e ovmeRinses Lawrence 0. Beard, Lancaster, Pa. Application J uly 2 9, 1932Serial No. 625,917 I 3 Clairns. (Cl; '17- 2)-f I This inventionrelates'to tools for removing Whenthe stem 14 of'plug 13 is rotated inan ridges from the walls of cylinders, It iswell appropriatedirection,by a standard wrench or known that under constant reciprocatory pistonother suitable tool,not shown, the bevel face 15 movement the walls of ean. internal combustion of the body portion 25 of the plug will be movedengine gradually become worn, leaving an obdownwardly against thebeveled. inner. face 16 5 jectionable ridge at the top of the cylinderwhich of blades 9 thus forcing the blades outwardly interferes withproper piston action when new into contact with the wall of cylinderbore 3. piston rings are installed. v v I The toolas a whole is thenturnedapproximate- The general object of the present invention is 1y onerevolution by means of a suitable tool, not 10' to provide a simple formof cutting tool which shown, applied to the squared end 17' of projec-10 will effectively remove the, objectionable ridge tion .6',-'-and thisoperation-iis repeated as often just referred to. as necessary to removethe ridge 18, itbeingv Another object of the invention is to provideunderstood that the cutter blades will be slightly means for properguiding or piloting the cutter advanced or expanded after eachrevolution of l5 blades during operation of the tool. the cutter head byrotating stem 14. As pre- 13 Other and more specific objects andadvantages viously stated a standard wrench can be used to of theinvention will be apparent as the specirotate the expansion plug, theupper end of stem fication is considered in connection with the ac- 14thereof being provided with a tool engaging companying drawing, inwhich: squared end 19 for this purpose. If desirable Figure 1 is a planview of the improved tool rotation of the tool T and feeding of thecutter 20 in operative position on a cylinder block; blades can besimultaneously effected by the em- Figure 2 is a section on the line 22of Figployment of two wrenches for turning the cutter ure 1; v head andexpansion plug respectively. of course Figure 3 is a section on the line3-3 of Figthis would necessitate the workman using both ure 4; hands,one for each wrench. The cooperating 25 Figure 4 is a bottom plan viewof the cutter beveled faces 15 and 16 of the expansion plug and headshown in Figure 3; cutters are preferably formed of an angle of ap-Figure 5 is a side view of the rotary expanp o t y forty fi degrees tothe a of the sion plug for expanding the cutter blades; and ut r head bt any angularity may be emp e Figures 6 and '7 are perspective viewsshowing provided the angle is the same on each face. 30 I the rear andfront erids of the cutting blades The outer end face 20 of cutter blade9 is respectively. ground on'a slightly greater radius than the di-Referring more particularly to the drawing T ameter of the cylin to beground so ha a denotes the tool as a whole including a cutter bearingwill be had at both the front and rear head 1, having a dependingcylindrical body pilot edges 21 and 22 respectively. This face 35portion 2, adapted to be loosely received within 20 is also formed witha substantially re n the cylinder bore 3 of an internal combustion cutout or recessed portion 21' in the upper forengine, not shown. Arms orlugs 4, preferably ward edge thereof, the sharp cutting edge 22integrally formed, extending radially from the of which is in the samevertical plane as the front top of the body 2, seat upon the cylinderblock pilot edge 21, and in effect a continuation of such 40 5 andsupport the tool in place. A centrally discutting edge. In order toprovide a relief for posed upstanding projection 6 formed onrthe thecutting edge and to prevent Scoring 0 cutter head is provided with athreaded bore 7, scratching of the cylinder wall, the rear pilot edgecommunicating with an axially alined larger of the blade is slightlyrounded or honed off. It bore 8, extending to and through the bottom ofwill thus be seen that the blades 9 are guided or 45 body 2. piloted bythe pilot edges 21 and 22 both back Cutter blades 9 are slidably mountedin open of and below the cut out portion 21, thus efended radial slots10 formed in the cutter head factually eliminating chattering andinsuring unibody 2 and extending from the bore 8 to and formity andsmoothness of operation. through the outer periphery of the said body. ABy forming the lugs or arms 4 integral with 59 plate 11 secured to thebottom of the cutter the body of the cutter head it is possible to havehead by screws 12, holds the blades in place. Exthe cutters square withthe cylinder bore. When pension is effected by means of a beveled rotarythe tool is dropped in place, the cutting portions expansion plug 13 thethreaded stem 14 of which 21 of the blades will extend slightly abovethe is mounted in opening 7 previously referred to. bottom face of thelugs or arms 4 and consequently above the top of the cylinder thusinsuring engagement of the said cutting portions with the entire surfaceof the ridge 18 to be removed.

Having thus described my invention:

What I claim is:

1. A tool for removing ridges from the top of a cylinder comprising acylindrical cutter head body portion, three symmetrically arranged lugsextending radially from said body adapted to seat said body upon thecylinder block and suspend same into said cylinder, said body having acentral bore and open ended radial slots of substantial widthcommunicating with said bore, a hollow internally threaded extension onthe top of said body communicating with said bore, blades of substantialthickness adjustably mounted in said slots and formed with inner beveledends said blades having means on one end for relieving the cutting edgeof said blades, an expansion plug having a stem threadedly mounted insaid threaded extension and a beveled head portion freely engaging thebeveled ends of the blades, said stem and said extension have toolengaging extremities for the application of a wrench or other tool.

2. A tool for removing ridges from the top of a cylinder comprising abored cylindrical cutter head body portion, three symmetrically arrangedlugs extending radially from said body portion for supporting saidcutter head upon a cylinder block, said body having a plurality of wideradial slots communicating with the bore of the cutter head, a hollowintegral extension on said cutter head, heavy blades of substantialthickness adjustably mounted in said slots, said blades having cut outportions in one end for relieving the cutting edge of said blades, aheaded expansion plug having its stem rotatably mounted in saidextension and engaging with its free head portion said blades, wrenchengaging means on the stem of said expansion plug and said extension forselective rotation of said cutter head and said plug, cutting portionson said blades extending above the top of the cylinder and above theplane of the bottom face of said lugs.

3. A tool for removing ridges from the top of a cylinder comprising abored slotted cutter head, lugs on said head adapted to seat on the topof a cylinder block for rotatably supporting said head upon the blockand suspend same into the cylinder, a hollow extension on the cutterhead, heavy cutter blades in said slots, means rotatably mounted at oneend in said extension engaging with its free end, said blades for movingthe same outwardly in said slots, said extension and said means havingexterior wrench engaging surfaces, said blades having substantiallyrectangular cut out portions in an upper corner thereof for forming therelief for the cutting edge of said blades, and the outer end faces ofsaid blades being ground on a radius slightly greater than the diameterof the cylinder to be serviced thus forming pilot edges or bearingsurfaces below and behind said out out portions.

LAWRENCE O. BEARD.

